Electronic flash unit



FIG. 1 is a front elevational view of an electronic flash unit, showing our new design;

FIG. 2 is a right side elevation thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a left side elevational view thereof with the lamp head shown in upwardly adjusted position. 

The ornamental design for an electronic flash unit, substantially as shown and described. 